A constant volume of water was sprayed on various leaves and controls with different spray nozzles. Quantity of water retained on the leaf was determined using gram precision scale and runoff determined. Use of large diameter nozzle increased run-off by 80% in all types of surfaces. Surfaces with greater number of hairs and ridges exhibited lesser runoff with smaller nozzles. Medium nozzles were more effective for surfaces with fewer hairs and ridges.

 

Different volumes of water were sprayed and quantity of water retained on the leaf was determined by measuring the difference in weight before and after runoff using gram precision scale. As volume increases, the run-off also increases. However, percentage of runoff remains constant between 95% and 100%.

 

***Note: This experiment was also conducted on other surfaces. Results were similar.